spec for writable layers - #451
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stefanhaRH
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| The index entries have the same format as defined in previous section, | ||
| except that they are not sorted and may have overlap. The field `moffset` | ||
| points to location in the coresspoding data file. |
stefanhaRH
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| The `sparse_rw` flag is set to 1 (true) in the header. | ||
| The payload part of the file is initialized as a sparse region that | ||
| is as large as the `virtual_size` of the image, without occupying | ||
| disk space. Data will be written to coressponding locations with |
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What this PR does / why we need it:
add spec for writable layers